Revert "window-list: Fix initial visibility"

Since we no longer track fullscreen state in the overview,
the workaround is no longer necessary.

This reverts commit 6ee4205f1e.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/409>
(cherry picked from commit a3ff3c79b2)

extensions/window-list/extension.js

@@ -1035,9 +1035,6 @@ class WindowList extends St.Widget {
             }, this);
 
         global.display.connectObject('in-fullscreen-changed', () => {
-            // Work-around for initial change from unknown to !fullscreen
-            if (Main.overview.visible)
-                this.hide();
             this._updateKeyboardAnchor();
         }, this);